Concrete screeding apparatus



United States Patent [72] Inventor Arvid Kalns 541 Central Ave., Albany, New York 12206 [2]] Appl. No. 824,546

[22] Filed May 14,1969

[45] Patented Dec. 1, 1970 [54] CONCRETE SCREEDING APPARATUS 6 Claims, 5 Drawing Figs.

[52] U.S. Cl 94/45 [51] lnt.Cl. E01c 19/22 [50] Field of Search 94/45, 50

[56] References Cited UNITED STATES PATENTS 909,499 1/1909 Williamson 94/50UX 1,670,785 5/1928 Schutte 94/45UX 2,318,002 5/1943 MacGregor 94/50 2,509,675 5/1950 Cox 94/50X Primary Examiner-Jacob L. Nackenoff AttorneyD. Emmett Thompson ABSTRACT: A series of annular members is fixedly mounted on a shaft rotated by power. The annular members are arranged concentrically with the shaft and are inclined relative to the axis of the shaft. The shaft is supported with the peripheries of the annular members engaging the concrete surface.

Patented Dec 1, 1910 .v H a a w w a ll i fi irnu INVENTOR. KALNS IARVID ATTORNEY CONCRETE SCREEDING APPARATUS BACKGROUND OF THE INVENTION Freshly poured flat concrete surfaces are initially treated by being leveled off in a process known as screeding. Initially, the screeding was performed by reciprocating a straight edge in the form of a board while moving it lengthwise of the surface. Usually, the concrete is poured between side frame members, and the board screed is rested upon the side members while it is being manually manipulated More recently, power operated screeds have been employed. Such screeds consist of an elongated beam adapted to extend transversely of the poured surface. An eccentric weight is journalled on the beam and rotated by a gasoline engine. The rotating eccentric weight imparts vibration to the beam. The vibration of the beam is imparted to the concrete surface and results in bringing the fines of the concrete to the surface to effect a flat, relatively smooth, surface. Such screeds are cumbersome to handle and, due to the excessive vibration, the maintenance is a factor of some magnitude.

BRIEF SUMMARY OF THE INVENTION The screed embodying my invention consists of a series of annular members spaced along a shaft and fixedly secured thereto in such manner that the annular members incline relative to the axis of the shaft. The shaft is journaled in a frame for movement over the concrete surface, with the peripheries of the annular members engaging the surface of the concrete. The shaft is rotated by power. Due to the inclination of the annular members, they engage the concrete wobble plate fashion-that is, the lower portion of the annular members are reciprocated on the surface of the concrete in a direction parallel to the shaft. The operation of the screed produces substantially no vibration, whereby it is convenient to manipulate manually in smaller sizes.

In larger sizes for screeding concrete surfaces of substantial width, the frame structure may be advanced along the form rails by power. The screeding apparatus is particularly advantageous in use in conjunction with concrete slab forming machines.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a front elevational view of a screeding apparatus embodying my invention.

FIG. 2 is an end elevational view looking to the left, FIG. 1.

FIG. 3 is an enlarged view taken on line 3-3, FIG. 1.

FIG. 4 is a view, in perspective, of one of the annular members and contiguous portion of the shaft on which it is mounted.

FIG. Sis a view taken on line 55, FIG. 3.

DETAILED DESCRIPTION The frame of the machine consists of a beam 10, to each end of which is affixed a plate 11 of trapezoidal form. A base plate 12 is fixed to the lower edge of each of the plates 11, as by welding. A bearing 13 is fixed to the outer surface of each ofthe plates 11. A shaft 14 is journaled in the bearings 13 and extends parallel to the beam in downwardly spaced relation thereto. A series of annular members 17 are arranged in spaced relation along the shaft 14. The members 17 are mounted concentric with the shaft 14 by spoke members 18. The annular members 17 are rectangular in cross section. The spoke members 18 consist of fiat plates which are apertured at their centers to receive the shaft 14 and are fixed thereto, as by welding. Spoke plates 18 extend diametrically of the annular members and the ends of the plates are welded to the inner surfaces of the members. This mounting arrangement is such that each annular member is inclined to the axis of the shaft.

As shown in FIG. 1, the members 17 are inclined at an angle about 30 to the axis of the shaft.

Bearings 23 are mounted on the plates 11 adjacent the upper edges thereof. A hydraulic motor 25 is mounted on the beam 10 and operatively connected to shafts 27, the outer ends of which are journaled in the bearings 23. The outer ends of the shafts 27 are provided with sprockets to receive chains 28 which are also trained about sprockets fixed to the ends of the shaft 14. An engine 30 is mounted on the beam 10 and serves to operate a hydraulic pump 31 to furnish fluid under pressure to the motor 25. The flow of fluid to the motor 25 is controlled by a valve 33 having an operating rod 34 extending to one end of the framework and being bent to form a handle 35, see FIG. I. The outer end of the rod 34 isjournaled on the top ofa housing 37 fixed to one of the end plates 11. A similar housing is fixed to the end plate 11 at the other end of the frame. These housings serve to cover and protect the drive mechanism from the shafts 27 to the shaft 14. The housings 37 are fixed to the end plates 11 by screws 39. The outer wall 38 of each housing is provided with a handle 40 for convenient movement of the screed along the form rails 41. Angle guide members 42 are adjustably mounted on the under side of the base plates 12, and are adjustable in a direction lengthwise of the shaft 14 to accommodate spacing of the side forms 41, and serve in the guidance of the screed therealong. The forward and rear ends of the base plate 12 are curved upwardly, as at 43, FIGS. 2 and 3.

The shaft 14 is rotated in a direction indicated by arrow 15. The screed is moved along the rails 41 in the direction of arrow 16. The upper and rear portions of the rotary screed are covered by an arcuate guard member 44. The guard is fixed at its ends to plates 54 journaled on shaft 14, for adjustment of the guard about the axis of the shaft. The plates are formed with handles 45 having yielding engagement with notches formed in plates 46 fixed to the end plates 11.

While the screed apparatus is shown in a form for manual manipulation, it will be apparent that rollers may be provided at the ends of the frame structure and powered by the engine 30 for movement of the screed along the side forms 41 for screeding concrete surfaces of substantial width. The plastic concrete does not collect, or build up, between the annular members.

Iclaim:

1. Apparatus for screeding a newly poured concrete surface comprising a frame, a shaftjournaled in said frame, a series of annular members mounted concentrically of said shaft in spaced apart relation, spoke means fixedly securing each of said members to said shaft in a position inclined to the axis of said shaft, means for supporting said shaft above the concrete surface for movement therealong with the peripheries of said annular members engaging said surface, and power means operatively connected to said shaft to effect rotation thereof.

2. Apparatus as defined in claim I, wherein said annular members are rectangular in cross section.

3. Apparatus as defined in claim 1, wherein said annular members are rectangular in cross section, the axial dimension of said members being substantially greater than the radial dimension.

4. Apparatus as defined in claim 1 including means restraining axial movement of said shaft.

5. Apparatus as defined in claim 1, wherein said spoke means consists ofa member extending diametrically of each of said annular members, said members being fixed at their centers to said shaft and being fixedly secured at their ends to said members.

6. Apparatus as defined in claim 1 and including a guard member of arcuate form enclosing the upper and rear sides of said series of annular members. 

